Microstructure and properties of Ti-modified low temperature plasma nitrided  stainless steel used in dental implant surgical instruments

doi:10.13251/j.issn.0254-6051.2023.12.034

Abstract

Abstract: Ti-modified low temperature plasma nitriding (LPNTi) was conducted for 304 austenitic stainless steel used for dental implant surgical instruments, and the goal was to effectively enhance the hardness and wear resistance without sacrifice of its corrosion resistance. Optical microscope, SEM, EDS, X-ray diffractometer (XRD), microhardness tester and friction and wear tester were used to investigate the microstructure and properties. The results show that the plasma nitriding efficiency can be remarkably improved by Ti-modification, which is more than 4 times of that by traditional low temperature plasma nitriding (LPN), with the thickness of nitrided layer increasing from 11.37 μm by LPN to 48.32 μm by LPNTi under the same nitriding condition of 420 ℃×4 h. Meanwhile, the surface hardness is significantly enhanced from 978 HV0.025 to 1350 HV0.025 by Ti-modification. The wear resistance is dramatically enhanced as well, with the mass wear rate decreasing from 20.9 μg/(N·m) to 7.4 μg/(N·m), decreasing about 2/3 by Ti-modification.

Key words: 304 austenitic stainless steel, low temperature plasma nitriding (LPN), Ti-modified low temperature plasma nitriding (LPNTi), corrosion resistance, wear resistance

CLC Number:

TG161

Gu Jingyi, Li Runtao, He Ze, Hu Jing. Microstructure and properties of Ti-modified low temperature plasma nitrided stainless steel used in dental implant surgical instruments[J]. Heat Treatment of Metals, 2023, 48(12): 201-205.

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Microstructure and properties of Ti-modified low temperature plasma nitrided stainless steel used in dental implant surgical instruments

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